From ff11452e25c8172759e808bbcd48ead70079ce72 Mon Sep 17 00:00:00 2001
From: Alexey Kudravtsev <cdr@intellij.com>
Date: Fri, 14 Jul 2017 18:57:18 +0300
Subject: [PATCH] reduce latency on typing in non-project files

---
 .../openapi/fileEditor/impl/IdeDocumentHistoryImpl.java    | 4 ++++
 .../impl/NonProjectFileWritingAccessProvider.java          | 7 ++++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/IdeDocumentHistoryImpl.java b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/IdeDocumentHistoryImpl.java
index b792a259c1bb..15793c351689 100644
--- a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/IdeDocumentHistoryImpl.java
+++ b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/IdeDocumentHistoryImpl.java
@@ -298,6 +298,10 @@ public class IdeDocumentHistoryImpl extends IdeDocumentHistory implements Projec
     return VfsUtilCore.toVirtualFileArray(files);
   }
 
+  public boolean isRecentlyChanged(@NotNull VirtualFile file) {
+    return myRecentlyChangedFiles.CHANGED_PATHS.contains(file.getPath());
+  }
+
   @Override
   public final void clearHistory() {
     myBackPlaces.clear();
diff --git a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/NonProjectFileWritingAccessProvider.java b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/NonProjectFileWritingAccessProvider.java
index c3270ec73d20..d6ae49596733 100644
--- a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/NonProjectFileWritingAccessProvider.java
+++ b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/NonProjectFileWritingAccessProvider.java
@@ -34,7 +34,6 @@ import com.intellij.openapi.util.registry.Registry;
 import com.intellij.openapi.vfs.*;
 import com.intellij.openapi.vfs.ex.temp.TempFileSystem;
 import com.intellij.project.ProjectKt;
-import com.intellij.util.ArrayUtil;
 import com.intellij.util.NullableFunction;
 import com.intellij.util.containers.ContainerUtil;
 import org.jetbrains.annotations.NotNull;
@@ -121,8 +120,10 @@ public class NonProjectFileWritingAccessProvider extends WritingAccessProvider {
 
     if (!(file.getFileSystem() instanceof LocalFileSystem)) return true; // do not block e.g., HttpFileSystem, LightFileSystem etc.
     if (file.getFileSystem() instanceof TempFileSystem) return true;
-    
-    if (ArrayUtil.contains(file, IdeDocumentHistory.getInstance(project).getChangedFiles())) return true;
+
+    IdeDocumentHistoryImpl documentHistory = (IdeDocumentHistoryImpl)IdeDocumentHistory.getInstance(project);
+
+    if (documentHistory.isRecentlyChanged(file)) return true;
     
     if (!getApp().isUnitTestMode()
         && FileUtil.isAncestor(new File(FileUtil.getTempDirectory()), VfsUtilCore.virtualToIoFile(file), true)) {